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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629ac14f9be1c932bcd53c4ed918ce5b1d0717826038ca7f0f9084296192ff64' 
  AND token = 'YrDgUWh7vt2OeaW2Hu2j2vmkbkN7kAtmjL1F/susLnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}